Two shows this week deserve a look — and both hail from the Roundabout, albeit at very different price points.

An orchestra seat for Broadway’s “Thérèse Raquin” costs $137, but this gets you heated sex, white-knuckle suspense, spooky gothic ambience and a murder in a real boat floating in real water.

Oh, and a confident Broadway-debut performance from Keira Knightley, as a small-town adulteress.
Knightley’s love interest isn’t too shabby, either: Matt Ryan — a Welsh actor best known for playing the title character in NBC’s “Constantine” — is the kind of unabashed hunk Broadway desperately needs.

At half the price, Stephen Karam’s “The Humans” delivers big emotions on an intimate scale — catch it now before it hits Broadway early next year.

Set at a Thanksgiving dinner in a rundown Chinatown apartment, the show is an alternately hilarious and wrenching dissection of family dynamics. Led by Reed Birney and Jayne Houdyshell, the stunning cast is acutely tuned to the flawed but deeply endearing characters.

Watch in particular for Cassie Beck’s breakthrough performance as the older daughter, the family rock now facing a breakup, medical issues and the loss of her job.

Sound like a downer? Fear not: That character also happens to be the funniest of the bunch.